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In recent works on intersubband transitions (ISBT) in modulation-doped multiquantum well (MQW) structures it has been found that very large exchange dipole moments are induced along the growth direction of the epi-layers. A variety of applications that makes use of these transitions have been proposed and demonstrated such as infrared (IR) detectors,1 harmonic generators,2 Kerr modulators,3 and more.
© 1994 IEEE
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